Cartridge-type audio-visual projector

Claim 2

An audio-visual projector comprising a body case, a guide portion formed in said body case, optical and magnetic sound reproducing means positioned adjacent to said guide portion and being selectively movable to a working position by the setting operation of said film cartridge, optical and magnetic sound reproducing circuits connected to said optical and magnetic sound reproducing means, respectively, a projection lamp positioned adjacent to said guide portion, a lamp circuit included in said body case to control the lighting of said projection lamp, a lens block positioned adjacent to said guide portion and being movable into the light path of said projection lamp, and a screen positioned on one side wall of said body case and being receivable of the light from said projection lamp through said lens block, said magnetic sound reproducing circuit containing a magnetic head, an input circuit connected to said magnetic head, and a transistor having the collector electrode connected to said input circuit, and when said optical sound reproducing means is moved to its working position, both terminals of said magnetic head are short-circuited through said input circuit and said transistor.

Claim 3

An audio-visual projector comprising a body case, a guide portion formed in said body case, optical and magnetic sound reproducing means positioned adjacent to said guide portion and being selectively movable to a working position by the setting operation of said film cartridge, optical and magnetic sound reproducing circuits connected to said optical and magnetic sound reproducing means, respectively, a projection lamp positioned adjacent to said guide portion, a lamp circuit included in said body case to control the lighting of said projection lamp, a lens block positioned adjacent to said guide portion and being movable into the light path of said projection lamp, and a screen positioned on one side wall of said body case and being receivable of the light from said projection lamp through said lens block, said lamp circuit comprising a power source switch, a transformer connected to said power source switch, and a change-over switch connected to one terminal of said projection lamp of which the other terminal is connected to one terminal of a secondary winding of said transformer to connect said one terminal of said projection lamp to any one of the intermediate terminal and the other terminal of said secondary winding, whereby when said power source switch is closed said projection lamp is lit up preliminarily.

Claim 4

An audio-visual projector comprising a body case, a guide portion formed in said body case, optical and magnetic sound reproducing means positioned adjacent to said guide portion and being selectively movable to a working position by the setting operation of said film cartridge, optical and magnetic sound reproducing circuits connected to said optical and magnetic sound reproducing means, respectively, a projection lamp positioned adjacent to said guide portion, a lamp circuit included in said body case to control the lighting of said projection lamp, a lens block positioned adjacent to said guide portion and being movable into the light path of said projection lamp, and a screen positioned on one side wall of said body case and being receivable of the light from said projection lamp through said lens block, said lamp circuit comprising a power source switch, a transformer connected to said power source switch, and a change-over switch connected to one terminal of said projection lamp of which the other terminal is connected to one terminal of a secondary winding of said transformer to connect said one terminal of said projection lamp to any one of the intermediate terminal and the other terminal of said secondary winding, whereby when said power source switch is closed said projection lamp is lit up preliminarily.

Claim 5

An audio-visual projector comprising a body case, a guide portion formed in said body case, optical and magnetic sound reproducing means positioned adjacent to said guide portion and being selectively movable to a working position by the setting operation of said film cartridge, optical and magnetic sound reproducing circuits connected to said optical and magnetic sound reproducing means, respectively, a projection lamp positioned adjacent to said guide portion, a lamp circuit included in said body case to control the lighting of said projection lamp, a lens block positioned adjacent to said guide portion and being movable into the light path of said projection lamp, and a screen positioned on one side wall of said body case and being receivable of the light from said projection lamp through said lens block, said projector further comprising an interlocking lever manually operable and engageable with a supporting plate supporting said lens block, a lock lever engageable with said interlocking lever, and a film loop detecting member engaged with said lock lever and engageable with the film housed in said film cartridge, and when said interlocking lever is manually operated said interlocking lever is locked by said film loop detecting member through said lock lever, and further when said detecting member is moved by the film said interlocking lever is released by the movement of said detecting member.

Claim 6

An audio-visual projector comprising a body case, a guide portion formed in said body case, optical and magnetic sound reproducing means positioned adjacent to said guide portion and being selectively movable to a working position by the setting operation of said film cartridge, optical and magnetic sound reproducing circuits connected to said optical and magnetic sound reproducing means, respectively, a projection lamp positioned adjacent to said guide portion, a lamp circuit included in said body case to control the lighting of said projection lamp, a lens block positioned adjacent to said guide portion and being movable into the light path of said projection lamp, and a screen positioned on one side wall of said body case and being receivable of the light from said projection lamp through said lens block, said projector further comprising an interlocking lever manually operable and engageable with a supporting plate supporting said lens block, a lock lever engageable with said interlocking lever, and a film loop detecting member engaged with said lock lever and engageable with the film housed in said film cartridge, and when said interlocking lever is manually operated said interlocking lever is locked by said film loop detecting member through said lock lever, and further when said detecting member is moved by the film said interlocking lever is released by the movement of said detecting member.

Claim 7

An audio-visual projector comprising a body case, a guide portion formed in said body case, optical and magnetic sound reproducing means positioned adjacent to said guide portion and being selectively movable to a working position by the setting operation of said film cartridge, optical and magnetic sound reproducing circuits connected to said optical and magnetic sound reproducing means, respectively, a projection lamp positioned adjacent to said guide portion, a lamp circuit included in said body case to control the lighting Of said projection lamp, a lens block positioned adjacent to said guide portion and being movable into the light path of said projection lamp, and a screen positioned on one side wall of said body case and being receivable of the light from said projection lamp through said lens block, said lens block containing a first reflecting mirror rotatably supported in said lens block, and said projector further comprising a door having a second reflecting mirror thereon and arranged so as to open and close on a side wall of said body case and capable of rotating said first reflecting mirror, and when said door is opened the light from said projection lamp is led to the outside of said body case through said first and second reflecting mirrors.

Claim 8

An audio-visual projector comprising a body case, a guide portion formed in said body case, optical and magnetic sound reproducing means positioned adjacent to said guide portion and being selectively movable to a working position by the setting operation of said film cartridge, optical and magnetic sound reproducing circuits connected to said optical and magnetic sound reproducing means, respectively, a projection lamp positioned adjacent to said guide portion, a lamp circuit included in said body case to control the lighting Of said projection lamp, a lens block positioned adjacent to said guide portion and being movable into the light path of said projection lamp, and a screen positioned on one side wall of said body case and being receivable of the light from said projection lamp through said lens block, said lens block containing a first reflecting mirror rotatably supported in said lens block, and said projector further comprising a door having a second reflecting mirror thereon and arranged so as to open and close on a side wall of said body case and capable of rotating said first reflecting mirror, and when said door is opened the light from said projection lamp is led to the outside of said body case through said first and second reflecting mirrors.